In an overclocking feat by XtremeSystems community members Elmor and Kinc, an ASUS EAH5870 MATRIX Radeon HD 5870 graphics card was able to achieve a mind-boggling core speed of 1525 MHz (core) from its default speed of 894 MHz, and AMD reference speed of 850 MHz. This translates into 70% over default speeds, and 79% over reference speeds. The not-so-relevant memory overclock was 1300 MHz (5.2 GHz effective), an 8.3% overclock. The card was cooled using liquid-nitrogen evaporators.

This wasn't a "hit-and-run" feat, either. The stability of the GPU at 1500 MHz was proven with a run of 3DMark Vantage, where it scored P29342 points at the performance preset. The rest of the bench comprised of an Intel Core i7 980X Extreme Edition six-core processor running at 4492.9 MHz, at 1.52V, also cooled by liquid nitrogen, ASUS Rampage III Extreme motherboard, 6 GB of Corsair Dominator GTX DDR3 memory, and Antec 1200W power supply. The validation for the 3DMark Vantage run where it scored P30542 can be found here.